Stopping mechanism for shoe-sewing machines



' June 19, 1928.

Filed Oct. 27, 1924 2 Sheets-Sheet June 19, 1928.

J. ADRIAN STOPPING MEOHANISM FOR SHOE SEWING MACHINES 2 Sheets-Sheet 2 File d Oct. 27, 1924 Patented June 19, 1928.

tin-Eran l JAKOB ADRIAN, OF OBERURSEL, GERMANY.

STOPPING MECHANISM FOR SHOE-SEWING- MACHINES.

Application filed October 27, 1924, Serial No. 746,164, and. in Germany March 1, 1924'.

It is wellknown in shoe sewing machines to sto' the driving shaft in a position suitable f br the removal and the introduction of the work. To this end the driving shaft has been braked and then stopped by a rigid stud or the like. It is also not new to control the stopping mechanism by balance weights in order to stop the shaft at a predetermined speed.

It is the object of the present inventionto stop the driving shaft of a shoe or like sewing machine without shock in apredetermined position and at a predetermined speed. This object is attained by drawing the brake-band taut, by a stud secured to a balance weight revolving with. the shaft. When the speed of the shaft diminishes to a predetermined degree the stud on the balance weight operates the brake. Preferably a spring connected to the foot-treadle clutching and declutching the machine operates to draw the brake-band to some degree..prepara tory to drawing it taut before the stud of the balance weight becomes operative.

In the accompanying drawings Figure 1 shows the parts of the stopping mechanism while the machine is running at normal speed;

Figure 2 is a cross-section of the line A-B of Figure 1;

Figure 3 illustrates the starting wedge w in the position corresponding to Figure 1;

Figure 4 shows the parts while the machine is stopped;

Figure 5 is a cross-section on the line B-C of Figure 4; i

Figure 6 illustrates the starting wedge :11 the position corresponding to Figure 4; Figure 7 shows another embodiment of the invention in the position occupied while the machine is running;

Figure 8 is a vertical section of the parts shown in Figure 7 Figure 9 corresponds to Figure 7 with the parts in the stopped position.

Referring to Figure 1 the driven shaft 1 journalled in the head of the machine receives its motion from the shaft 2. The shaft 2 is propelled by the loose pulley 3 when the friction discs 1*, s, are pressed against each other. This is done by the wedge q of the treadle m depressed against zhe action of the spring'n.

On the shaft 1 there is keyed a brake drum z co-acting externally with the brake-band h. The brake-band is connected at one end 0 when returning into the to the bolt of the'brake lever o and at the other end to the shackle z. -The latter is adjustable on the shaft .y. The brakelever v is pivoted to the bar t of the starting treadle m. By depressing the treadle the brake-band la is released; on the other hand the brake-band is drawn taut when the starting treadle is raised by the spring n.

The balance weights 0, d, are pivoted on the bolts 6 within the drum a. They are connected to each other by the link e. The spring 7' fastened at one endto the drum and at the other end to the weight 0 tends to keep the weights in the inner position shown in Figure 4. When the shaft 1 is running with the nornial speed the weights are carried by their centrifugal force into the outer position shown in Figure 1. 1 By releasing the treadlem the shaft'2 is declutched and the parts t,' v, draw the band is taut. The speed of the shaft diminishes rapidly until at a certain point the balanceweights returning to their inner position act to stop the shaft 1. I

To this end the brake-band la is connected by the shackle z to one end of a twoarmed lever z pivoted on the shaft 3 The other end of the lever 71 is into contact with the stud g of the weight inner position. The'lever i has a hooked part i pivoted on the bolt Z. The spring 2" is so arranged as to swing the hooked. part i" on the bolt Z away from and out of engagement with the stud 9. So long as the shaft 2 is coupled to the driving pulley 3 (see Figure 1) the stopping stud 9 does not operate. On the other hand when the treadle is freed, the wedge-shaped end w of the brake-lever v raises and-swings the nose of the lever-part 21"into the path of the stud g. As soon as the stud g, moving with diminishing speed,

comes under the nose of the lever part i and enters its notch it, it drags with it the lever z and draws the band is taut to such a degree as to stop the drum 1; with the shaft 1, see Figures4 and 5.- By adjusting the shackle a a relatively fast or slow stopping may be obtained.-

By depressing the treadle m the band. 70 is released, the wedge a lowered and the lever part 2'" frees the stud g.

From" the foregoing it will be apparent that the new mechanism obviates a sudden stopping of the revolving parts, which upadapted to come sets the accurate adjustment of thediiferent I v 1 9, the separate journals band 70, while the sewing machine, a

. to drawing it swings on the hub trifug sewing instrumentalities. If however the brake-band is drawn taut at a predetermined low speed of the machinethe shocks may be diminished to a harmless degree.

To stop the machine the treadle m is released. The spring 0?. acts through the levers m, t, and 1) to draw the brake band is. .The speed of the shaft 1 diminishes and the weight g swings inward until its stud g engages the hooked end i" of the lever- 11 and definitely stops the machine. 7

In the embodiment shown in Figures 7 to for the levers i, 'v, Moreover the lever 2' 0 of the journaL of the shaft to be stopped itself. This lever carries, as in the example already described, meansof the shackle 2, one end of the other end of the band is attached to the bolt w of a slide p. This slide is arranged at the upper end of the bar t and isnguided by its gudgeon u in the vertical slot of the lever 2' Thegudgeonu projects with its flattened end from the slot and is adapted to come into contact with are dispensed with.

the stud g of the weight a. \Vith the weights swung out the gudgeon is inoperative, see

F'gure 7. But as soon as the treadle-is released the speed diminishes and the spring f brings the weights into their inner position; the stud g comes into contact 'with the gudgeon u and tends to drag it along. By this means the lever z, is swung out and the brake-band is drawn taut.

What I claim is '1.'-In a stopping mechanism of a shoe driven shaft, a brake drum on the driven shaft, a brake band on the drum, and a balance weight revolving with the shaft and adapted to draw the band taut, a spring counter-acting the cenal "force of the balance weight, a spring drawing the brake band preparatory by the balance weight, and

sewing machine, a

' and adapted a treadle unclutching the machine operated by the said spring.

2. In a stoppingmechanism of a shoe drum on the driven shaft, a brake band on the drum, a balance weight revolving with the shaft and adapted to draw taut the brake band, a member carrying one end of the brake band and 'adapted tocome in the path of the balance weight, and means connected to the treadle for bringing the said member into the said path.

' In a stopping mechanism of a shoe sewing machine, a driven shaft; a brake drum on the dniye'n" shaft, a brake band on the drum, a balance weight revolving with the shaft and .adapted to draw the band taut, a member carrying one end of the brake band and adapted to come in the path-of the balance weight and to act as a stop for the rotating shaft when the band" is drawn taut, a treadle for unclutching the machine, and means connected to the treadle for ibfinging the said member into the said path. v

4. In a. stopping mechanism of a shoe sewing machine, a driven shaft, a brake drum onthe driven shaft, a brake band on the drum, a balance weight revolving with the shaft and adapted to taut, 'a lever carrylng one ber carrying end of the brake band, a memthe other end of the brake band to come v.in the path of the balance weight, a treadle for unclutching the machine,

treadle for moving the said lever and the said member relatively to each other in order to draw the brake band talft about the brake drum, r

' In testimony whereof I afiixjmy signature. x q

revoluble about the shaft and and means operated bythe.

driven shaft, .a brake draw the band mail; ADRIAN. I 

